Details: The gold standard for building and testing grip strength, Captains of Crush (CoC) Grippers are designed for maximum progress in minimum time. The world leader for over 20 years, CoC Grippers use premium materials and are made in the USA. 11 strengths for a perfect fit, whether you are a rank beginner or a World's Strongest Man winner, CoC Grippers are the single most important grip strength tool you can choose.